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Juniper JN0-683 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Data Center Interconnect: For Data Center Engineers, this part focuses on interconnecting data centers, covering Layer 2 and Layer 3 stretching, stitching fabrics together, and using EVPN-signaled VXLAN for seamless communication between data centers.
Topic 2
  • Data Center Multitenancy and Security: This section tests knowledge of single-tenant and multitenant data center setups. Candidates such as Data Center Professionals are evaluated on ensuring tenant traffic isolation at both Layer 2 and Layer 3 levels in shared infrastructure environments.
Topic 3
  • EVPN-VXLAN Signaling: This section assesses an understanding of Ethernet VPN (EVPN) concepts, including route types, multicast handling, and Multiprotocol BGP (MBGP). It also covers EVPN architectures like CRB and ERB, MAC learning, and symmetric routing.

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Juniper Data Center, Professional (JNCIP-DC) Sample Questions (Q76-Q81):

NEW QUESTION # 76
Due to heavy congestion, some VXLAN packets are being lost. In this scenario, which two statements are correct? (Choose two.)

Answer: A,C

Explanation:
VXLAN encapsulation is carried over UDP and does not include any built-in acknowledgement or retransmission mechanism. When packets are lost in transit, recovery is handled by the transport/application behavior of the endpoints (for example, TCP at the hosts detects loss and triggers retransmission).


NEW QUESTION # 77
Exhibit.

Both DC and DC2 ate using EVPN-VXLAN technology deployed using an ERB architecture. A server on the Red VLAN must communicate with a server on the Green VLAN. The Blue VLAN in DC and DC2 needs to be the same VLAN.
Which statement is correct in this scenario?

Answer: A

Explanation:
* ERB Architecture in EVPN-VXLAN:
* ERB (Edge Routed Bridging) architecture is commonly used in data center networks where routing decisions are made at the network edge (leaf or border devices), while bridging (Layer 2 forwarding) is extended across the fabric. This architecture allows for efficient L3 routing while still enabling L2 services like VLANs to span across multiple locations.
* VLAN and VNI Configuration:
* The scenario specifies that a server on the Red VLAN needs to communicate with a server on the Green VLAN. Since these VLANs are in different data centers (DC and DC2), and given the use of EVPN-VXLAN, the communication between these VLANs will require atransit VNI(Virtual Network Identifier). This transit VNI will allow traffic to traverse the VXLAN tunnel across the DCI (Data Center Interconnect).
* Interconnect between SRX Series Devices:
* The exhibit shows SRX Series Chassis Clusters used as service devices (likely for firewalling or other security services). These devices need to be interconnected between the two data centers to ensure that VLANs can communicate effectively. The Blue VLAN needs to be stretched between DC and DC2 to maintain the same Layer 2 domain across both data centers.
Conclusion:
* Option B:Correct-Interconnecting the SRX Series devices will ensure the necessary service chaining, while stretching the Blue VLAN and adding a transit VNI for the Red and Green VLANs will enable the required communication across the data centers.


NEW QUESTION # 78
You are implementing VXLAN broadcast domains in your data center environment. Which two statements are correct in this scenario? (Choose two.)

Answer: A,C

Explanation:
Layer 2 frames are encapsulated by the source VTEP: In a VXLAN environment, Layer 2 frames (Ethernet frames) are encapsulated by the source VTEP (VXLAN Tunnel Endpoint) into VXLAN packets. The VTEP adds a VXLAN header to the original Layer 2 frame and forwards the encapsulated packet over the IP network to the destination VTEP.
A VXLAN packet does not contain a VLAN ID: VXLAN operates at Layer 2 and encapsulates Ethernet frames within a VXLAN header, but it does not carry a traditional VLAN ID as part of the encapsulated packet. Instead, it uses a VXLAN Network Identifier (VNI) to identify the broadcast domain.


NEW QUESTION # 79
You are setting up an EVPN-VXLAN architecture for your new data center. Its initial deployment will be less than 50 switches; however, it could scale up to 250 switches over time supporting
1024 VLANs. You are still deciding whether to use symmetric or asymmetric routing.
In this scenario, which two statements are correct? (Choose two.)

Answer: A,C

Explanation:
Symmetric routing needs an extra VLAN with an IRB interface for each L3 VRF instance:
Symmetric routing requires an additional VLAN (and corresponding VNI) with an IRB interface for every Layer 3 VRF instance, supporting inter-VLAN routing at every VTEP.
Symmetric routing supports higher scaling numbers: Symmetric routing is preferred for environments with high scaling needs (such as 1024 VLANs and up to 250 switches) because it avoids the scalability limitations seen in asymmetric routing, which requires all VLANs and VNIs to be configured on every switch, leading to configuration complexity and overhead.


NEW QUESTION # 80
Click the Exhibit button. Connections between hosts connected to Leaf-1 and Leaf-2 are not working correctly.
Referring to the exhibit, which two configuration changes are required to solve the problem?
(Choose two.)

Answer: A,B

Explanation:
Configure the set switch-options service-id 1 parameter on Leaf-2: The service ID parameter should be consistent between the two leaf switches in order to ensure proper EVPN operation.
The service ID helps to associate the EVPN instance with the correct context. Configuring the same service-id 1on both Leaf-1 and Leaf-2 will allow them to properly intercommunicate.
Configure the set switch-options vrf-target target:65000:55 parameter on Leaf-2: The vrf- targetdefines the routing target for VRF routes in the EVPN context. Since Leaf-1 has vrf- target target:65000:55, Leaf-2 must also have the same VRF target to ensure consistent route propagation between the two switches.


NEW QUESTION # 81
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